Yes the Soloist does some things that the B22 does not. And vice versa but I put more weight in what's there than what is missing. For example, in a bass weight or body contest... the Soloist isn't in the running. But for laser focus and clarity the B22 lags behind the Soloist.
That said, the real 'damn that's something' piece might be the Peak with a Sylvania Bad Boy. While listening to my 'busy/separation' demo song the Peak was mind blowing. It hasn't done that again since and I ran the Burson through a burn cycle last night so we'll see where they stand tonight.
After having lived with the HA-160D for so long I wouldn't have thought the Soloist was one not biased into class A very far, and two lacking in weight or body. But there it is. The case clearly has room to increase the bias to at least twice what it is now. The 1W Peak running near hot and the 4W Soloist is cool. One of them has a case that can sink heat and isn't taking advantage of it.
Having never heard a Schiit and obviously not heard the Mjolnir... I'm looking forward to that one too :D